Drafting board with machined edge guide



March 11, 1958 v o. DOMPIERI DRAFTING BOARD WITH MACHINED EDGE GUIDE 2Sheets-Sheec 1 Filed July 6, 1955 O l. I

' INVENTOR Orro .DOMP/E2/ fiw %ATTORNEY March 11, 1958 o. DOMPIERI2,825,999

DRAFTING BOARD WITH MACHINED EDGE GUIDE Filed July 6, 1955 2Sheets-Sheet 2 INVENTOR Orro floM nse/ ATTORNEY DRAFTING BOARD WITHMACHINED EDGE GUIDE Otto Dompieri, North Plainfield, N. J.

Application July 6, 1955, Serial No. 520,270

1 Claim. (Cl. 45-131) This invention relates to drawing boards, and moreparticularly to drawing boards of the type having metal side edges formaintaining a true edge for drawing purposes.

Drawing boards have customarily been made of wood and it has long beenrecognized that metal edges are desirable for the side edges of theboard to provide reinforcement against warping and at the same timeprovide a true edge for the T square generally used with drawing boards.

It has also been customary to space the metal edges from the faces ofthe board so as not to interfere with the use of either face of theboard as a drawing surface and also so as to provide an uninterruptedwood surface to receive the usual thumb tacks even at the extremelateral edges of the board.

The primary object of the present invention is to provide an improvedmethod of applying metal inserts to the lateral edges of a drawingboard.

A further object of the invention is to provide an inexpensive drawingboard of improved efliciency, simplified manufacture and improvedappearance.

Other objects and advantages of the present invention will be apparentfrom the following description taken in connection with the accompanyingdrawings, wherein:

Figure 1 is a perspective view of a drawing board embodying the presentinvention;

Figure 2 is an enlarged perspective view of one of the metal edgeinserts;

Figure 3 is an enlarged vertical sectional view through a metal edgeinsert and an end section of the drawing board just prior to assembly;

Figure 4 is an enlarged vertical sectional view taken on the line 44 ofFigure 1;

Figure 5 is a perspective view of a slightly modified form of drawingboard;

Figure 6 is an enlarged perspective view of the metal edge insert shownin Figure 5; and

Figure 7 is a plan view of the board shown in Figure 5 with a section ofthe board broken away.

Referring in detail to the modification shown in Figures 1 to 4, thedrawing board comprises a wooden body 10 having along each of its sideedges a rectangular groove 11 intermediate of the upper and lower facesof the body and terminating at the front and rear edges of the board,and metallic members 12 extending entirely along the side edges of theboard and anchored thereto.

Each of the metallic members 12, consists of a T-shaped bar having asubstantially rectangular leg 13 of approximately the same size asrectangular groove 11 to have a tight fit therewith, and the cross bar14 having a width slightly less than the thickness of the board 10 asclearly shown in Figure 4. The upper and lower surfaces of the leg 13are provided with grooves 15. The cross bar 14 has its outer face planedand ground to a perfectly straight and true surface and has its innerface slightly recessed at 16 for a purpose to appear. The edges of themetal members 12 are beveled at 17 to enhance the appearance of theboard.

To assemble the metal ends and the board, the grooves are filled with asuitable adhesive 18, the leg 13 innited States Patent 0 2,825,999Patented Mar. 11, 1958 serted in the groove 11 and the metal edge drivenhome with the ends of the metal edge flush with the front and rear edgesof the board. Since the leg 13 has a fairly tight fit with the groove11, some of the adhesive in the grooves 15 will spread and cover thesurface of the groove as seen in Figure 4, thereby insuring adhesivecontact throughout between the leg and the groove 11. Any excessadhesive flowing out of the groove 11 will be trapped in the spaceformed between the recessed portions 16 and the side edges of the board.

In the modification shown in Figures 5 to 7, the board is indicated bynumeral 19, the metal edge members by numeral 20 and the groove in theboard by numeral 21. In this form of the invention, the groove 21 doesnot ex tend to the front and rear edges of the board and is providedwith curved surfaces 22, as seen in Figure 7. The metal edge 20 is thesame as the metal edge 12 shown in the first form except that the endportions of the leg 23 are cut away to form curved edges 24 to lieagainst curved surfaces 22. The leg 23 is provided with grooves 25similar to the grooves 15. The manner of assembly is the same as thatdescribed in connection with the form of invention shown in Figures 1 to4. In this form of the invention, the metal edges terminate short of thefront and rear edges of the board.

From the foregoing description, the advantages of the presentconstruction will be readily apparent to those skilled in the art. WhileI have shown the invention applied to a metal edge drawing board, itwill be apparent that the invention may be applied to drawing tables orany other form of table top where a metal edge is desirable. While Ihave shown two modifications of the invention, other modifications andchanges in details may be made without departing from the spirit of theinvention except as may be required by the scope of the following claim:

Having thus described the invention, what is claimed In a drafting boardto be used with a T square, a planar warpable body, opposite sides ofwhich providing planar surfaces upon which drafting paper may besecured, a groove formed in the side edge of said body between theopposite sides thereof, a rigid metal edge strip secured by an adhesivematerial in said groove to prevent warpage of said body, said edge striphaving a T-shaped cross section providing a head normal to a leg, saidleg including longitudinal grooves on opposite sides thereof to receiveadhesive material therein to insure anchoring of said strip on saidbody, upper and lower edges of said head terminating below the oppositesides of said body and beyond the side edge thereof for obviatinginterference with sheets of drawing paper slid across the side of thebody used during drafting, the outer surface of said head comprising amachined surface affording a true edge for receiving the head of a Tsquare, the inner surface of said head diverging from the upper andlower edges of said head toward the intersection of said head and legfor providing a space to receive excessive adhesive material thereinwhich is squeezed out of said groove when the leg is inserted thereinduring assembly of said board.

References Cited in the file of this patent UNITED STATES PATENTS2,030,730 Wilson Feb. 11, 1936 2,272,058 Dieter et al. Feb. 3, 19422,509,037 Flicker May 23, 1950 2,717,187 Morgan et a1. Sept. 6, 19552,734,789 Wilson Feb. 14, 1956 FOREIGN PATENTS 737,244 Germany July 9,1.943

